The Collaborative International Dictionary of English v.0.48:

Impregnate \Im*preg"nate\ ([i^]m*pr[e^]g"n[=a]t), v. t. [imp. &
   p. p. Impregnated (-n[asl]*t[e^]d); p. pr. & vb. n.
   Impregnating (-n[asl]*t[i^]ng).] [LL. impraegnatus, p. p.
   of impraegnare to impregnate, fr. L. pref. im- in + praegnans
   pregnant. See Pregnant.]
   1. To make pregnant; to cause to conceive; to render
      prolific; to get with child or young.
      [1913 Webster]

   2. (Biol.) To come into contact with (an ovum or egg) so as
      to cause impregnation; to fertilize; to fecundate.
      [1913 Webster]

   3. To infuse an active principle into; to render fruitful or
      fertile in any way; to fertilize; to imbue.
      [1913 Webster]

   4. To infuse particles of another substance into; to
      communicate the quality of another to; to cause to be
      filled, imbued, mixed, or furnished (with something); as,
      to impregnate India rubber with sulphur; clothing
      impregnated with contagion; rock impregnated with ore.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Impregnate \Im*preg"nate\ ([i^]m*pr[e^]g"n[=a]t), v. i.
   To become pregnant. --Addison.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Impregnate \Im*preg"nate\ (-n[asl]t), a. [LL. impraegnatus, p.
   p.]
   Impregnated; made prolific.
   [1913 Webster]

         The scorching ray
         Here pierceth not, impregnate with disease. --Byron.
   [1913 Webster]

WordNet (r) 3.0 (2006):

impregnate
    v 1: fill, as with a certain quality; "The heavy traffic
         tinctures the air with carbon monoxide" [syn: impregnate,
         infuse, instill, tincture]
    2: infuse or fill completely; "Impregnate the cloth with
       alcohol" [syn: impregnate, saturate]
    3: fertilize and cause to grow; "the egg was impregnated"
    4: make pregnant; "He impregnated his wife again" [syn:
       impregnate, knock up, bang up, prang up]

Moby Thesaurus II by Grady Ward, 1.0:

79 Moby Thesaurus words for "impregnate":
   bathe, beat into, besprinkle, brainwash, breathe, brew, catechize,
   charge, color, condition, cross-fertilize, cross-pollen,
   cross-pollinate, cross-pollinize, decoct, douche, dredge, drench,
   dress, drouk, dye, enrich, entincture, fatten, fecundate,
   fecundify, fertilize, fill, flavor, flush, fructify,
   get with child, get with young, imbrue, imbue, implant, impress,
   inculcate, indoctrinate, infiltrate, infix, infuse, inject,
   inoculate, inseminate, instill, interpenetrate, lave, leach,
   leaven, lixiviate, macerate, manure, penetrate, percolate,
   permeate, pervade, pollen, pollinate, pollinize, program,
   prolificate, rinse, saturate, season, seethe, soak, sodden, sop,
   souse, spermatize, steep, suffuse, temper, tincture, tinge,
   transfuse, wash, waterlog